 
(* ::Section:: *)
(* $LeviCivitaSign *)
(* ::Text:: *)
(*$LeviCivitaSign is a global variable that determines the sign in the result of a Dirac trace of four gamma matrices and gamma5.  $LeviCivitaSign is by default set to -1 which corresponds to the convention Tr[LC[a,b,c,d,5]] = -4*I*Eps[a,b,c,d]. Setting $LeviCivitaSign=-I  will switch to the FORM-convention..*)


(* ::Subsection:: *)
(* Examples *)
$LeviCivitaSign

Tr[GA[\[Mu],\[Nu],\[Rho],\[Sigma],5]]


(* ::Text:: *)
(*This sets the same convention as in FORM*)


$LeviCivitaSign=-I;
Tr[GA[\[Mu],\[Nu],\[Rho],\[Sigma],5]]


(* ::Text:: *)
(*Back to the standard value*)


$LeviCivitaSign=-1;